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Update release notes for 9.0 beta 4. Back-patch some changes that were made only in HEAD.
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‎doc/src/sgml/release-9.0.sgml

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<!-- $PostgreSQL: pgsql/doc/src/sgml/release-9.0.sgml,v 2.39.2.1 2010/07/27 19:01:04 petere Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/release-9.0.sgml,v 2.39.2.2 2010/07/29 21:18:16 tgl Exp $ -->
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<sect1 id="release-9-0">
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<title>Release 9.0</title>
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<simpara>2010-??-??</simpara>
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</note>
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<para>CURRENT AS OF 2010-07-29</para>
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<sect2>
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<title>Overview</title>
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<productname>PostgreSQL</> adds features that have been requested
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for years, like easy-to-use replication, a mass permission
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facility, and anonymous blocks. While past major releases have
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been quite conservative in their scope, this release shows a
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bold new desire to provide facilities that every new and existing
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user of <productname>PostgreSQL</> will embrace. This has all
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been done with few incompatibilities. The major areas of
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enhancement are:
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been conservative in their scope, this release shows a
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bold new desire to provide facilities that new and existing
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users of <productname>PostgreSQL</> will embrace. This has all
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been done with few incompatibilities. Major enhancements are:
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</para>
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<itemizedlist>
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<para>
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Broadly enhanced stored procedure support.
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The <link linkend="SQL-DO"><command>DO</></link> statement permits
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ad-hoc or anonymous code blocks. Functions can now be called using named
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anonymous code blocks. Functions can now be called using named
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parameters. PL/pgSQL is now installed by default, and PL/Perl and
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PL/Python have been enhanced in several ways, including support for
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Python3.
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<sect2>
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<title>Migration to Version 9.0</title>
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<para>CURRENT AS OF 2010-07-08</para>
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<para>
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A dump/restore using <application>pg_dump</application>
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<para>
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Adjust <link
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linkend="guc-log-temp-files"><varname>log_temp_files</></link> to
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use default file sizes units of kilobytes (Robert Haas)
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use default file size units of kilobytes (Robert Haas)
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</para>
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</listitem>
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<para>
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This feature is called Streaming Replication.
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Previously <acronym>WAL</> files could be sent to standby systems only
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as 16 megabytes files; this allows master changes to be sent to the
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as 16 megabytes files; Streaming Replication allows master changes to be sent to the
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standby with very little delay. There are new <filename>postgresql.conf</>
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and <filename>recovery.conf</> settings to enable this
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feature, as well as extensive <link
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Outer joins where the inner side is unique and not referenced in
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the query are unnecessary and are therefore now removed. This will
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accelerate many automatically generated queries, such as those created
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by object-relational mappers.
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by object-relational mappers (ORM).
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</para>
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</listitem>
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</para>
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<para>
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This lets DBAs and security staff to audit when database settings
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This lets DBAs and security staff audit when database settings
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were changed.
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</para>
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<para>
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Add <link linkend="SQL-ALTERDEFAULTPRIVILEGES"><command>ALTER
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DEFAULT PRIVILEGES</></link> command to control privileges
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of all newly-created objects (Petr Jelinek)
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of newly-created objects (Petr Jelinek)
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</para>
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<para>
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This greatly simplifies the assignment of object priveleges in
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a complex database application. Defaults currently support tables
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This greatly simplifies the assignment of object privileges in
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a complex database application. Defaults currently support tables,
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views, sequences, and functions. Defaults may be assigned on a
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per-schema basis or database-wide.
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</para>
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<para>
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This allows <command>UPDATE tab SET col = col + 1</> to work on
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columns that have a unique indexes or are marked as primary keys,
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columns that have a unique indexes or are marked as primary key,
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but <literal>DEFERRABLE INITIALLY DEFERRED</> must be used to mark
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the constraint as deferred.
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</para>
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</listitem>
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<listitem>
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<para>
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Generalize uniqueness constraints by allowing arbitrary operator
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Exclusion Constraints: generalize uniqueness constraints by allowing arbitrary operator
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comparisons, not just equality (Jeff Davis)
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</para>
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<listitem>
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<para>
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Implement anonymous functions using the <link
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linkend="SQL-DO"><command>DO</></link> statement (Petr
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Jelinek, Joshua Tolley, Hannu Valtonen)
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linkend="SQL-DO"><command>DO</></link> statement, a.k.a anonymous
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blocks (Petr Jelinek, Joshua Tolley, Hannu Valtonen)
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</para>
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<para>
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</para>
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<para>
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This can be enabled with the server variable <link
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This can be globally enabled with the server variable <link
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linkend="guc-plperl-use-strict">plperl.use_strict</link>.
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</para>
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</listitem>
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</para>
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</listitem>
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<listitem>
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<para>
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Show <literal>\timing</> output when enabled, regardless of
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<quote>quiet</> mode (Peter Eisentraut)
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</para>
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</listitem>
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</itemizedlist>
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<sect5>
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<listitem>
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<para>
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Add the <literal>string</> data type in <application>ecpg</>
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Informix-compatibility mode (Zoltan Boszormenyi)
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Informix-compatibility mode (Boszormenyi Zoltan)
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</para>
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</listitem>
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<listitem>
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<para>
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Allow <application>ecpg</> to use noise words <literal>FROM</> and
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<literal>IN</> in <command>FETCH</> and <command>MOVE</> (Zoltan
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Boszormenyi)
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<literal>IN</> in <command>FETCH</> and <command>MOVE</> (Boszormenyi
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Zoltan)
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</para>
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</listitem>
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